Chaining multiple RB750UP

Hardware MikroTik hardware general
1

What is the realistic max number of chained RB750UP units? Like this:

RB750UP #1 ether2 (PoE out) - cable - RB750UP #2 ether1 (PoE in)
RB750UP #2 ether2 (PoE out) - cable - RB750UP #3 ether1 (PoE in)
RB750UP #3 ether2 (PoE out) - cable - RB750UP #4 ether1 (PoE in)

… and so on - where the #1 is powered by 24V DC jack, all devices have PoE out disabled on ether3-ether5 (used only as ethernet ports), and cables are about 90-100m length of good quality copper FTP cat5e?
The idea may sound a bit crazy - if it was 300-400m point-to-point, it would be better to lay fiber instead, but the branches in the middle (each with 1-3 customers connected) would require an expensive G(E)PON solution which ptobably isn’t worth it (doing it all on my own, without any EU money), and the copper wires also supply power while fiber doesn’t.

2

you could try to chain 2 routers according to “napkin math”

you could try to calculate yourself (if you have at least one) how much you will lose if router is powered via 100m cable. as every cable is special, and most of the losses IMHO you will have over the cable.

3

I would like to point out that if you have more money than sense, you can power your device via fiber now: http://lasermotive.com/products/power-over-fiber/

I’d suggest sacrificing a box of cable, chopping it into 3 lengths and testing the whole 750UP setup. I bet it will work as long as you use decent quality cable.